Christopher James Huff <cja### [at] gmailcom> wrote:
> In article <web.42300839aa72325b598059850@news.povray.org>,
>  "lien0n" <nomail@nomail> wrote:
>
> > plane{z,-0.00001
> >   pigment {
> >     image_map {
> >       function 256 128 { pigment {
> >         color (1-Factor(x,y,z).gray)*Wetting(x,y,z) +
> > Drying(x,y,z)*Factor(x,y,z).gray     (*)
> >       }}
> >     }
> >   }
> > }
>
> Break the pigment out to see what's going wrong:
> pigment {
>     color (1-Factor(x,y,z).gray)*Wetting(x,y,z) +
>            Drying(x,y,z)*Factor(x,y,z).gray
> }
>
> Put simply...you can't do this. There's no mechanism in standard POV-Ray
> for taking a color function and using it directly as a pigment color. If
> there were (and if this were corrected to extract gray values from
> Wetting() and Drying()), this would still give a grayscale result.
>
> It is possible, though...just a bit tricky. You have to average 3
> separate pigments, with the colors multiplied by 3 to counter the divide
> in the average so you can get a straight add.
>
> pigment {average
>     pigment_map {
>         [1
>             function {(1-Factor(x,y,z).red)*Wetting(x,y,z).red +
>                Drying(x,y,z).red*Factor(x,y,z).red}
>             color_map {[0 rgb 0] [1 red 3]}
>         ]
>         [1
>             function {(1-Factor(x,y,z).green)*Wetting(x,y,z).green +
>                Drying(x,y,z).green*Factor(x,y,z).green}
>             color_map {[0 rgb 0] [1 green 3]}
>         ]
>         [1
>             function {(1-Factor(x,y,z).blue)*Wetting(x,y,z).blue +
>                Drying(x,y,z).blue*Factor(x,y,z).blue}
>             color_map {[0 rgb 0] [1 blue 3]}
>         ]
>     }
> }
>
> Oh, and for the sake of your disk space, bandwidth, and everyone else,
> please don't use BMPs. PNGs let you do everything they do and more, are
> compressed, and are lossless.
>
> --
> Christopher James Huff <cja### [at] gmailcom>
> POV-Ray TAG: <chr### [at] tagpovrayorg>
> http://tag.povray.org/

Yes, i tried and it works, many thks!

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